Impeller



FIG. 1 is a front perspective view of the impeller showing our new design;

FIG. 2 is a side elevation view thereof, with the front of the impeller facing to the left of the page;

FIG. 3 is a front view thereof;

FIG. 4 is a back perspective view thereof; and,

FIG. 5. is a back view thereof. 

CLAIM The ornamental design for an impeller, as shown and described herein. 